ckeditor/_source/plugins/autogrow/plugin.js

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/*
Copyright (c) 2003-2011, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/

/**
 * @file AutoGrow plugin
 */
(function(){

	// Actual content height, figured out by appending check the last element's document position.
	function contentHeight( scrollable )
	{
		var overflowY = scrollable.getStyle( 'overflow-y' );

		var doc = scrollable.getDocument();
		// Create a temporary marker element.
		var marker = CKEDITOR.dom.element.createFromHtml( '<span style="margin:0;padding:0;border:0;clear:both;width:1px;height:1px;display:block;">' + ( CKEDITOR.env.webkit ? '&nbsp;' : '' ) + '</span>', doc );
		doc[ CKEDITOR.env.ie? 'getBody' : 'getDocumentElement']().append( marker );

		var height = marker.getDocumentPosition( doc ).y + marker.$.offsetHeight;
		marker.remove();
		scrollable.setStyle( 'overflow-y', overflowY );
		return height;
	}

	var resizeEditor = function( editor )
	{
		if ( !editor.window )
			return;

		var doc = editor.document,
			iframe = new CKEDITOR.dom.element( doc.getWindow().$.frameElement ),
			body = doc.getBody(),
			htmlElement = doc.getDocumentElement(),
			currentHeight = editor.window.getViewPaneSize().height,
			// Quirks mode overflows body, standards overflows document element
			scrollable = doc.$.compatMode == 'BackCompat' ? body : htmlElement,
			newHeight = contentHeight( scrollable );

		// Additional space specified by user.
		newHeight += ( editor.config.autoGrow_bottomSpace || 0 );

		var min = editor.config.autoGrow_minHeight != undefined ? editor.config.autoGrow_minHeight : 200,
			max = editor.config.autoGrow_maxHeight || Infinity;

		newHeight = Math.max( newHeight, min );
		newHeight = Math.min( newHeight, max );

		if ( newHeight != currentHeight )
		{
			newHeight = editor.fire( 'autoGrow', { currentHeight : currentHeight, newHeight : newHeight } ).newHeight;
			editor.resize( editor.container.getStyle( 'width' ), newHeight, true );
		}

		if ( scrollable.$.scrollHeight > scrollable.$.clientHeight && newHeight < max )
			scrollable.setStyle( 'overflow-y', 'hidden' );
		else
			scrollable.removeStyle( 'overflow-y' );